US2022229273A1PendingUtilityA1

Optical Imaging System, Recognition Module and Electronic Device

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Assignee: ZHEJIANG SUNNY OPTICS CO LTDPriority: Jan 21, 2021Filed: Dec 17, 2021Published: Jul 21, 2022
Est. expiryJan 21, 2041(~14.5 yrs left)· nominal 20-yr term from priority
Inventors:Jiachen CuiFujian DaiLiefeng Zhao
G02B 13/0035G02B 9/12
52
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Claims

Abstract

The disclosure provides an optical imaging system, which sequentially includes from an object side to an image side along an optical axis: a first lens with a negative refractive power, an object-side surface thereof is a concave surface; a second lens with a positive refractive power; and a third lens with a positive refractive power; wherein an effective focal length f of the optical imaging system and, an Entrance Pupil Diameter (EPD) of the optical imaging system satisfy: f/EPD<1.6; an effective focal length f2 of the second lens and an effective focal length f3 of the third lens satisfy a conditional expression: 0.5<f2/f3<1.7; and Semi-FOV is a half of a maximum field of view of the optical imaging system satisfies: Semi-FOV>70°.

Claims

exact text as granted — not AI-modified
What is claimed is: 
     
         1 . An optical imaging system, sequentially comprising from an object side to an image side along an optical axis:
 a first lens with a negative refractive power, an object-side surface thereof is a concave surface;   a second lens with a positive refractive power; and   a third lens with a positive refractive power;   wherein an effective focal length f of the optical imaging system and, an Entrance Pupil Diameter (EPD) of the optical imaging system satisfy: f/EPD<1.6; and Semi-FOV is a half of a maximum field of view of the optical imaging system, and Semi-FOV satisfies: Semi-FOV>70°.   
     
     
         2 . The optical imaging system according to  claim 1 , wherein an effective focal length f2 of the second lens, an effective focal length f3 of the third lens and an effective focal length f1 of the first lens satisfy: 2.0<|(f2+f3)/f1|<2.5. 
     
     
         3 . The optical imaging system according to  claim 1 , wherein an effective focal length f3 of the third lens, a curvature radius R5 of an object-side surface of the third lens and a curvature radius R6 of an image-side surface of the third lens satisfy: −1.6<f3/R5+f3/R6<−0.9. 
     
     
         4 . The optical imaging system according to  claim 1 , wherein the effective focal length f of the optical imaging system, Semi-FOV and a curvature radius R3 of an object-side surface of the second lens satisfy: 1.5<f*tan(Semi-FOV)/R3<4.0. 
     
     
         5 . The optical imaging system according to  claim 1 , wherein a center thickness CT3 of the third lens on the optical axis and an edge thickness ET3 of the third lens satisfy: 1.5<CT3/ET3<2.1. 
     
     
         6 . The optical imaging system according to  claim 1 , wherein YO is an object height of a maximum imaging height of the optical imaging system, lmgH is a half of a diagonal length of an effective pixel region on an imaging surface, YO and lmgH satisfy: 4.0<YO/lmgH<5.5. 
     
     
         7 . The optical imaging system according to  claim 1 , wherein TD is an on-axis distance from the object-side surface of the first lens to an image-side surface of the last lens, TO is a distance from a photographed object to the object-side surface of the first lens on the optical axis, TD and TO satisfy: 0.5<TD/TO<1.0. 
     
     
         8 . The optical imaging system according to  claim 1 , wherein an on-axis distance SL from an aperture to the imaging surface satisfies: 1.0 mm<SL<1.5 mm. 
     
     
         9 . The optical imaging system according to  claim 1 , wherein SAG12 is an on-axis distance from an intersection point of an image-side surface of the first lens and the optical axis to an effective radius vertex of the image-side surface of the first lens, and SAG12 and an air space T12 between the first lens and the second lens on the optical axis satisfy: 1.0<SAG12/T12<1.5. 
     
     
         10 . An optical imaging system, sequentially comprising from an object side to an image side along an optical axis:
 a first lens with a negative refractive power, an object-side surface thereof is a concave surface;   a second lens with a refractive power; and   a third lens with a refractive power;   wherein an effective focal length f2 of the second lens and an effective focal length f3 of the third lens satisfy a conditional expression: 0.5<f2/f3<1.7; and Semi-FOV is a half of a maximum field of view of the optical imaging system, and Semi-FOV satisfies: Semi-FOV>70°.   
     
     
         11 . The optical imaging system according to  claim 10 , wherein an effective focal length f2 of the second lens, an effective focal length f3 of the third lens and an effective focal length f1 of the first lens satisfy: 2.0<|(f2+f3)/f1|<2.5. 
     
     
         12 . The optical imaging system according to  claim 10 , wherein an effective focal length f3 of the third lens, a curvature radius R5 of an object-side surface of the third lens and a curvature radius R6 of an image-side surface of the third lens satisfy: −1.6<f3/R5+f3/R6<−0.9. 
     
     
         13 . The optical imaging system according to  claim 10 , wherein the effective focal length f of the optical imaging system, Semi-FOV and a curvature radius R3 of an object-side surface of the second lens satisfy: 1.5<f*tan(Semi-FOV)/R3<4.0. 
     
     
         14 . The optical imaging system according to  claim 10 , wherein a center thickness CT3 of the third lens on the optical axis and an edge thickness ET3 of the third lens satisfy: 1.5<CT3/ET3<2.1. 
     
     
         15 . The optical imaging system according to  claim 10 , wherein YO is an object height of a maximum imaging height of the optical imaging system, lmgH is a half of a diagonal length of an effective pixel region on an imaging surface, YO and lmgH satisfy: 4.0<YO/lmgH<5.5. 
     
     
         16 . The optical imaging system according to  claim 10 , wherein TD is an on-axis distance from the object-side surface of the first lens to an image-side surface of the last lens, TO is a distance from a photographed object to the object-side surface of the first lens on the optical axis, TD and TO satisfy: 0.5<TD/TO<1.0. 
     
     
         17 . The optical imaging system according to  claim 10 , wherein an on-axis distance SL from an aperture to the imaging surface satisfies: 1.0 mm<SL<1.5 mm. 
     
     
         18 . The optical imaging system according to  claim 10 , wherein SAG12 is an on-axis distance from an intersection point of an image-side surface of the first lens and the optical axis to an effective radius vertex of the image-side surface of the first lens, and SAG12 and an air space T12 between the first lens and the second lens on the optical axis satisfy: 1.0<SAG12/T12<1.5. 
     
     
         19 . A recognition module, comprising the optical imaging system according to  claim 1  and an electronic photosensitive element, wherein the electronic photosensitive element is arranged on an imaging surface of the optical imaging system. 
     
     
         20 . An electronic device, comprising the recognition module according to  claim 19 .

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